DE20004086U1 - Ignition switch for gas stoves - Google Patents

Description

Ignition switch for gas stoves

The invention relates to an ignition switch for gas stoves, which can be operated by the control knob of a gas tap and applies voltage to the primary winding of a high-voltage transformer, whereby the ignition electrodes of all burners are ignited via its secondary winding in order to ignite the burner whose gas tap has been turned on via the spark gap.

It is known to assign a single ignition switch to all or some of the gas valves, which is closed by any of the gas valves whose burner is to be ignited via a common mechanical actuating element. Such an ignition switch is known, for example, from DE-PS 14 29 108 and DE 196 10 522 A1. In this case, the movement of the transmission element is caused either by pressing the operating knob or by rotating the actuating shaft.

EP 0 902 238 A1 also discloses an ignition device for gas stoves in which the only switch connected to the primary coil has electrodes running parallel to one another perpendicular to all the control shafts, which can be bridged via contact pieces assigned to the individual burners and which can be moved by pressing the control shaft in.

The use of such ignition switches, however, requires a certain design of the control panel of the gas stove, 5 in order to be able to accommodate the transmission elements or switching electrodes in a space-saving and operationally reliable manner.

The invention is based on the object of creating a generic ignition switch which is simple in construction, inexpensive to manufacture and can also be easily retrofitted in the area of the control shaft of any gas valve and which meets all safety requirements.

The task is solved by the features specified in the characterizing part of claim 1. The switching contacts can be connected in parallel and to the primary winding of the high-voltage transformer by means of cables that can be laid anywhere between the gas valves, regardless of the design of the control panel and the position of the control shafts of the gas valves. By converting the axial switching movement of the control shaft into a radial contact movement, the switch can be made low in height. This conversion of the axial movement into a radial movement is conveniently carried out via a wedge-thrust gear, whereby the ratio between axial and radial movement can be adjusted by selecting the wedge angle accordingly.

The fully encapsulated ignition switch itself can be pushed over the gas valve control shaft and secured to the stove. This can be done using screws. In general, however, it is only necessary to provide a rotation lock because the switch itself is covered by a front panel of the control panel. This rotation lock 0 can be provided by positive-locking projections on the switch that engage in corresponding recesses.

The contact between the terminals or contacts of the individual switches and the connecting cables is made using clamp-cutting technology, whereby the cable ends can be provided with commercially available flat plug sleeves.

The actuator of the ignition switch according to the invention is preferably designed in the form of a push button and is guided axially displaceably in the switch housing, and the adjusting button is forced back into the starting position by springs. The wedge-type thrust mechanism expediently has a slider which runs with a cam surface on an inclined surface of the push button and acts on a movable contact spring which returns the slider during the return stroke.

The push button of the switch can preferably be connected via a clamping ring to a locking washer that can be placed on the actuating shaft of the gas valve.

Further embodiments of the invention emerge from the subclaims.

An embodiment of the invention is described below with reference to the drawing. In the drawing:

0 Fig. 1 shows a perspective view

of the ignition switch viewed from below;

Fig. 2 shows a perspective view of the ignition switch from above

seeks;

Fig. 3 shows a vertical section of the ignition switch designed according to the invention; 30

Fig. 4 shows on a larger scale the detail X according to Fig. 3;

Fig. 5 shows a partially broken plan view of the inventive

ignition switch.

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The ignition switch has a rectangular housing 10 with a cover 12. The housing and cover have a through hole with the axis 14 for attaching to the gas valve axis. The cover has a conically tapered flange 16 around the hole. A push button is mounted in the housing so that it can be moved in the direction of the axis 14 against spring force. This push button consists of a cylindrical head 18 with a through hole 20 for the gas valve axis. The cylindrical head part is followed by a conical section 22, the cone angle of which corresponds to the cone angle of the flange 16. This conical section is followed by another cylindrical section 24, which is guided through housing walls 26. The push button has a lateral extension 34 within the housing with a bevel 36 directed downwards and inwards. A compression coil spring 38 supported on the housing base acts against this extension 34 and presses it upwards. Additional compression coil springs 40 are supported on the housing base and on the push button 22, 18 and press the push button into its initial position.

A slider 42 is mounted in the housing so that it can move radially with respect to the axis 14. This slider has a cam radius 44 which interacts with the bevel 36. When the push button is pressed down, the slider 42 is pushed outwards via this bevel 36 and the cam radius 44. A leaf spring 46 is applied to the slider 42, which is anchored in the housing at one end, presses the slider 42 against the bevel 36 and has an electrical contact 48 at the other end which interacts with a counter contact 50. The connection to the connections of the electrical contacts 48 and 50 is made using clamping technology.

On the underside of the housing base, projections 52 are arranged which, in conjunction with corresponding contours on the gas valve, ensure anti-rotation.

The switch is placed freely over the axis of the gas valve and anchored by means of a locking disk 55 sitting on the gas valve axis. By pressing in the axis of the gas valve, the push button 22, 18 is moved inwards against the force of the springs 38 and 40 via this axis and the locking disk with it, and the slide 42 is moved radially via the bevel 36 via the cam radius 44, and this slide takes the leaf spring 46 with it and causes contact to be made between the contacts 48 and 50. If the axis of the gas valve is released, the compression springs press the push button back to its starting position according to Fig. 3. The slide 42 is then free and the contacts 48, 50 open automatically due to their spring properties, and the slide 42 is returned to its starting position by the leaf spring 46.

The invention results in a low overall height of the switch, whereby a relatively high actuation stroke of, for example, 4.2 mm can be achieved, which is required for the various types of gas valve. The switch can be locked to a mounting plate on the housing using snap hooks. In special cases, if there is an acute lack of space, the gas valve can also be attached to the mounting plate using a nut.

The housing is designed in such a way that there is still room for a hexagon nut in the housing base. The flame on the gas valve can be subsequently regulated or adjusted in two positions 54 through the housing. The switch can be mounted on the valve in a total of four positions at 90° each. The electrical contacts 48, 50 of several gas valves are wired in parallel. The contact between terminals and contacts and the lines is made using clamp-cutting technology.

List of reference symbols

10 Housing 12 Lid 14 axis 16 flange 18 Head 20 Through hole 22 conical section 24 cylindrical section 26 Housing walls 28 Velcro 34 lateral process 36 bevel 38 Compression coil spring 40 Compression coil spring 42 Slider 44 Cam radius 46 Leaf spring 48 el.Contact 50 Contact 52 Projections 54 Holes 55 possible locking washer

Claims (8)

1. Ignition switch for gas cookers, the switching contacts ( 48 , 50 ) of which can be closed when the control shaft of a gas valve rotary switch is pressed in via an actuator ( 18 ) of the ignition switch which can be fixed on the control shaft in order to apply voltage to the primary winding of a high-voltage transformer, whereby the ignition electrodes of all burners are ignited via its secondary winding,
characterized by the following features: - the switching contacts ( 48 , 50 ) are accommodated in a housing ( 10 ) which can be attached to the control panel of the gas cooker and are provided with connection terminals; - the actuator ( 18 ) is mounted axially displaceably in the switch housing ( 10 ) and cooperates with means ( 36 , 44 , 42 ) which cause a radial closing movement of the switch contacts ( 48 , 50 ). 2. Ignition switch according to claim 1, characterized in that a wedge-type thrust gear ( 36 , 44 ) is provided between the actuator ( 18 ) and the switching contacts. 3. Ignition switch according to claim 2, characterized in that the wedge-type thrust gear has a bevel ( 36 ) connected to the push button ( 18 , 22 ) with which a cam surface ( 44 ) of a radially guided slide ( 42 ) cooperates, which acts on the spring contact ( 46 ). 4. Ignition switch according to claim 1, characterized in that the push button ( 18 , 22 ) is supported in the switch housing by compression coil springs ( 38 , 40 ). 5. Ignition switch according to claim 3, characterized in that the slide ( 42 ) is prestressed into the starting position by the leaf spring ( 46 ) of the spring contact ( 48 ). 6. Ignition switch according to claim 1, characterized in that the housing and the push button have a through opening for placement on the adjusting shaft of a gas valve rotary switch. 7. Ignition switch according to claim 6, characterized in that the housing has anti-rotation projections ( 52 ). 8. Ignition switch according to one of claims 1 to 7, characterized in that the push button has a cylindrical head ( 18 ) protruding from the housing and a conical section ( 22 ) which rests against a correspondingly conical flange ( 16 ) of the housing cover ( 12 ).